typedef struct _DD_LOCKDATA{
PDD_DIRECTDRAW_GLOBAL lpDD;
PDD_SURFACE_LOCAL lpDDSurface;
DWORD bHasRect;
RECTL rArea;
LPVOID lpSurfData;
HRESULT ddRVal;
VOID * Lock;
DWORD dwFlags;
} DD_LOCKDATA;
The DD_LOCKDATA structure is passed to the DirectDraw hardware interface's Lock surface object callback.
Members
lpDD
Pointer to the DD_DIRECTDRAW_GLOBAL structure that describes the driver.
lpDDSurface
Pointer to the DD_SURFACE_LOCAL structure that describes the surface associated with the memory region to be locked.
bHasRect
BOOLEAN that specifies whether rArea is valid.
rArea
RECTL that specifies the area on the surface to be locked down.
lpSurfData
Location in which the driver returns a pointer to the memory region that it locked down.
ddRVal
Location in which the driver returns a DirectDraw status return code. The status codes are defined in ddraw.h.
Lock
Unused by Windows NT.
dwFlags
Bitfield that tells the driver how to perform the memory lockdown. The DDLOCK_Xxx bit fields are enumerated in ddraw.h.